Question

Найти массу воды и массу соли, необходимые для получения 250 г 25% раствора

Answer 1

Ответ:

62,5;  187,5

Объяснение:

m=250 г

w=25% (0,25)

масса соли: m(c)=mw

масса воды: m(в)=m(1-w)

m(c)=250*0,25=62,5 г

m(в)=250*(1-0,25)=187,5 г

Answer 2

Calculating Mass of Water and Salt for a 25% Solution

To calculate the mass of water and salt needed to obtain a 250g 25% solution, we can use the following formula:

Mass of solute = (mass of solution) × (percent by mass of solute)

Mass of Water:

Using the formula, we can calculate the mass of water needed for the solution: Mass of water = (mass of solution) × (percent by mass of water)

Substituting the given values: Mass of water = 250g × (100% - 25%) Mass of water = 250g × 75% Mass of water = 187.5g

Mass of Salt:

Similarly, we can calculate the mass of salt needed for the solution: Mass of salt = (mass of solution) × (percent by mass of salt)

Substituting the given values: Mass of salt = 250g × 25% Mass of salt = 62.5g Therefore, to obtain a 250g 25% solution, you would need 187.5g of water and 62.5g of salt.